Is it possible to render 180º equirectangular with eevee engine?
It appears that this isn’t possible at present - but has been asked before and is expected to be a planned feature - see https://blenderartists.org/t/will-eevee-support-vr-equirectangular-rendering/699631 in particular :


  At last blender conference, there was a talk about the benefits of using Grease pencil + VR to create a scene.
  There are devs dedicated to VR. I don’t doubt that VR support for EEVEE is a goal they want to achieve.